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Segments of Operations - Earnings before income taxes by segment and sub-segment (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]    
Earnings before realized gains (losses) and income taxes $ 220 $ 174
Realized gains (losses) on securities 3 (18)
Earnings before income taxes 223 156
Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Property and casualty insurance underwriting 78 87
Investment and other income, net [1] 93 75
Earnings before realized gains (losses) and income taxes 171 162
Annuity    
Segment Reporting Information [Line Items]    
Earnings before realized gains (losses) and income taxes 96 53
Run-off Long-term Care and Life    
Segment Reporting Information [Line Items]    
Earnings before realized gains (losses) and income taxes 0 (1)
Other    
Segment Reporting Information [Line Items]    
Earnings before realized gains (losses) and income taxes [2] (47) (40)
Specialty Property and transportation | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Property and casualty insurance underwriting 43 32
Specialty casualty | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Property and casualty insurance underwriting 15 29
Specialty financial | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Property and casualty insurance underwriting 22 23
Other specialty | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Property and casualty insurance underwriting (1) 2
Other Lines | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Property and casualty insurance underwriting $ (1) $ 1
[1] Includes pretax income of $13 million (before noncontrolling interest) from the sale of a hotel in the first quarter of 2017.
[2] Includes holding company interest and expenses.